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How online extract works

The online data extract function runs in an IMS Fast Path (IFP) dependent region. BMC AMI Fast Path Online Analyzer for IMS completes an online data extract that is based on how you combine the EXTRACT command with its associated keywords and subcommands. This command syntax defines the inputs to (and the output from) the extract process.

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Extracting-data-from-an-online-DEDB

Control region requirement (ACCESS=UP)

When performing an online data extract, you must define the database to the IMS Control Region with ACCESS=UP.

Online data extract function inputs and outputs

The online data extract function extracts data from one or more area data sets of an online DEDB and writes the data to a sequential file.

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Process overview

Because the EXTRACT command makes only one pass through the data in the area, it is important to understand the chronological process that it executes. Subcommands and keywords are executed by the online data extract function to control data content and record formatting at each step in the process.

The following figure Online extract data control process shows how each step in the process is executed as specified by command language elements. However, because the availability of some options are dependent on other options, the subcommands and keywords are discussed in this section in the order that you should consider when becoming familiar with how to code a customized extract.

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